Rishi: Vājasaneyin ritual tradition (chandas-bandhu formula)
Devata: Agni; second hemistich invokes Chandas (Gāyatrī) as operative principle
Chandas: Gāyatrī (explicitly named; the mantra itself is a chandas-identification formula)
Samhita Patha (Devanagari)समि॑द्धो अ॒ग्निः स॒मिधा॒ सुस॑मिद्धो॒ वरे॑ण्यः । गा॒य॒त्री छन्द॑ इन्द्रि॒यं त्र्यविर्गौ॒र्वयो॑ दधुः
Transliterationsamídho agníḥ samídhā súsamiddho váreṇyaḥ | gāyatrī́ chánda indríyaṃ tryàvir gāúr váyo dadhúḥ
Translationসমিধাৰে অগ্নি সমিদ্ধ হৈছে—সুসমিদ্ধ, বৰণীয়। গায়ত্ৰী ছন্দ—ইন্দ্ৰীয় বীৰ্য; ত্ৰিবিধ মেষী, গাভী আৰু প্ৰাণবল—এইসকলক তেওঁলোকে স্থাপন কৰিলে।
Padapatha (Word Analysis)समि॑द्धः । अ॒ग्निः । स॒मिधा॑ । सु-समि॑द्धः । वरे॑ण्यः । गा॒य॒त्री । छन्दः॑ । इ॒न्द्रि॒यम् । त्रि-अ॒विः । गौः । वयः॑ । द॒धुः
Word by Wordसमिधाwith fuel-stick / by kindling-fuel वरेण्यःmost choice-worthy / excellent गायत्रीGāyatrī (metre/deity) त्र्यविःthe threefold ewe (symbolic) दधुःthey placed / bestowed 
Entities MentionedI
Indra (as indriya/vigour) Viniyoga (Ritual Application)